if i used existing laser focusing tube, with lens and everything, and i drill two holes inside a tube, parallel to each other with conductors inside them so they make a spark gap, and discharge 320 kV inside it, would light that is emitted from air plasma be sufficient to make nice beam? few details : i could use four 25kV capacitors connected to voltage multiplier stage as source for highvoltage pulse. laser pulse time would be somewhat equal to capacitor charge time. maybe low-pass frequency filter to make the spark brighter. and yeah, spark would be 1 cm long, and breakdown treshold for air to become plasmatic is 32 kV/cm. so i would have 10 times more voltage, thus plasma pulse would be really bright and powerfull.